I think you need to clarify what you mean by libertarian capitalists as their delusionary states are a sliding scale. The AnCap is even less realistic than any Marxist and much more likely to be motivated by shitty behavior (Marxists might not be correct about everything but their hearts are in a good place), whereas the neoliberal is likely confused about how the impacts of free trade can harm the local working classes and might not be as beneficial as classic economics suggests.

Krugman, Mankiew et al are often writing opinion pieces and those should be seen as such.

I don’t think economics should be discussed in any format other than print as it is too hard to check the work on a video.

That’s vastly less common than uneducated Marxists. The right-libertarians just tend to be idealistic and/or super racist.